In the movies, the Odd Couple was Jack Lemmon & Walter Mattau. On TV it was Tony Randall & Jack Klugman. All were perfectly cast & played well off each other. One of my favorites!
From the play:
Oscar: "you leave me little notes on my pillow, I HATE little notes on my pillow, 'we're all out of cornflakes - FU. It took me 3 weeks to realize FU stood for Felix Unger; it's not your fault, just a lousy combination".